Trussed bar for railway-brakes



(No Model.)

S. ALLEY. TRUSSED BAR FOR RAILWAY BRAKES.

No. 461,776. Patented Oct. 20, 1891.

NITED STATES" Enron.

ATENT STEPHEN ALLEY, OF GLASGOW', SCOTLAND, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE NATIONAL HOLLOW BRAKE BEAM COMPANY, OF CHI- OAGO, ILLINOIS.

TRUSSED BA'R FOR RAILWAY-BRAKES.

SPECIFICATION forming part of Letters Patent No. 461,776, dated October 20, 1891. Application filed December 1, 1890. Serial No. 373,266. (No model.) Patented in England December 12,1881,N0. 5,421.

To all whom Z27 may concern:

Be it known that I, STEPHEN ALLEY, engineer, a subject of the Queen of Great Britain, residing at Glasgow, in the county of Lanark,

5 Scotland, have invented certain newand useful Improvements in Truss-Bars for Railway-Brake Apparatus, (for which I obtained British Letters Patent No. 5,421, dated December 12, 1881;) and the following is a full,

[ clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

- My said invention relates to the truss-bars used in certain kinds of railway apparatus for carrying and moving the brake-blocks; and the object of it is to make such truss-bars in a stronger and at the same time simpler and better manner than heretofore. Each trussbar is a triangular frame, the main member of which is a transverse horizontal bareX- tending across underneath the wagon or carriage and having attached at the ends the two brakeblocks for one side of the two wheels on one axle. The two other members of the frame are inclined bars connecting the ends of the main member to a link-piece placed midway between the wheels and connected to the lever or other piece by which the movements for putting on and taking off the brakes are communicated.

By my present invention the main member of the truss or frame is preferably made of channel or U-section iron, and the two 5 minor members are made of a single bar of square or round or other simply-shaped iron. The parts are put together in the approved manner and hereinafter particularly described with the aid of a sheet of explana- 4o tory drawings, which is hereunto appended and on which the same reference-numerals are used to mark the same or like parts wherever they are repeated.

Figure l on the accompanying sheet of 5 drawings is a sectionalview, and Fig. 2 is a plan or face View, of one modification of my improved trusses or frames, While Fig. 3 is a sectional detail. Fig. 4 is an end View of a second modification. Fig. 5 is a plan View of said second modification; and Figs. 6 and 7 5 are cross-sections of the transverse bar 8 of the second modification near the center and at one end, respectively.

7 The transverse bar 8, forming the main member of the truss or frame, is preferably made of channel-iron of the section shown in Figs. 1 and 3, and the two minor members are made of a single bar, which in this example is of a square section. The link-piece 10 for the middle is formed with an eye 11, through which the bar 9 for the two minor members is passed, and the eye is then Welded on the bar, and the two parts of the bar are then welded to the proper inclinations. The ends of the two minor member 9 are bent so as to become parallel to the main member 8, and are placed in the channel at the ends of that member, which is then closed and then welded upon them. The sides of the channeliron at the ends of the main member 8 may be closed so as to entirely inclose the ends of the minor members 9 or so as to form a joint with only the sides closed, and journals 12, with or without collars, are formed on the ends to receive the iron shoes of the brake blocks. The main member 8 is bypreference made with a slight curvature, as shown, being concave on the inner side facing the linkpiece 10 to give increased rigidity. If desired, additional strength may be given to the 8o truss or frame in a manner shownin Fig. 5- that is to say, by forming the link-piece 10 with the rod 13 extending to the middle of the main member 8. A small cross-head is forged on the end of the rod 13, as indicated by dotted lines at 14 in Fig. 5, and this crosshead is entered into the channel of the main member 8 and the sides are closed upon and welded to it; or theend of the rod 13, formed without cross-head or lateral enlargement, may be simply entered into the channel of the main member 8 and have the sides closed and welded upon it. The modification shown in plan or face view in Fig. 5 is shown in end view in Fig. 4, and Figs. 6 and '7 are cross-sections. In this example the minor members 9 are made of a round bar; but a bar of any other simple and suitable form may be used,

and the middle rod 13 maybe round, square, or other suitable section and may be used with minor or inclined members 9, of square or other section.

Having thus particularly described my said lnvention and the manner of performing the same, I have to state that I do not restrict myself to the precise details herein described or delineated, but that what I believe to be novel and original and claim as the invention secured to me by and in terms of the hereinbefore in part recited Letters Patent is 1. A trussed metal brake-beam in which are combined a eoncavo-convex compression member, a double-inclined tension member, and an interposed strut or draft piece, substantially as and for the purpose specified.

2. A trussed metal brake-beam in which are combined a concavo-convex cambered compression member and a double-inclined tenslon member, substantially as and for the purposes specified.

A metal brake-beam in which are combined a concave-convex compression member and a double-inclined tension member, said members having their ends welded together for the reception of the brake-block, substantially as and for the purposes specified.

4. A trussed brake-beam having a tension member and a concave compression member adapted to receive the ends of the tension member, substantially as and for the purposes specified.

5. A trussed brake-beam having its link or draft piece integral with the post or strut and in advance of the tension member of said trussed structure.

6. In a brake-beam, the combination of a tension member, a strut or post, and a compression member of concavo convex form in cross-section for the reception of the ends of the tension member and strut, substantially as and for the purposes specified.

7. A brake-bean1 having a tension member, a concavo-convex compression member, and journals at its ends formed by the lapping of the compression member on the tension member, substantially as and for the purposes specified.

In testimony whereof I alfix my signature inpresence of two witnesses.

EDWIN L. Jenn P. MITCHELL. 

